If you don't know enough to talk expertly in character, you switch to out of character and describe what you are trying to do from that perspective.

We... offer you some advice on how to integrate this into your games and make them more fun.

Transcript

Chewbacca: I'm shutting down everything but the emergency power.
C-3PO: You better not shut me down!
GM: The Falcon shudders suddenly.
[SFX]: shake rumble
Han: Chewie, did you put the handbrake on?
C-3PO: Maybe the asteroid got smashed into pieces and now we're in a smaller chunk!
Chewbacca: 3PO, come with me. I need a steady pair of hands.
{they leave}
GM: The ship shakes again. Dex rolls, everyone.
Leia: Ugh.
[SFX]: shake rattle
Han: I catch her!
Leia: Let go, please.
Han: Hey baby, what's a nice girl...
Han: Um. Etcetera, etcetera. Flirty roleplaying stuff.
Leia: Don't get existential.
Han: Princess, holding you is quite enough to get me all existential.
Leia: Sorry, I haven't got time to explain what "existential" means to you.
Han: Wait... explain it to me, or explain it to me?